Bookbinding-gum



- To all whom it may concern:

UNITED STATES PATENT OFFICE.

SAMUEL n BRICK, or SALINA, mess; LILLIAN is. 33101: nxnourmx or su smear. in. warez, nncnnsnn.

' IBOOKIBINDING-GUM,

No Drawing.

Be it known that I, SAMUEL E. BRICK, a citizen of the United States, residing at Salina, in the county of-Saline and State of Kansas, have invented certain new and useful Improvements in a Bookbinding-Gum, of which the following is a specification.

This invention relates to adhesives and l more particularly to an improved tabbing and book binding gum.

The primary object of this invention is to provide an improved gum having advantages over the tabbing gum described in my co-pending application, Serial #237 ,77 1, filed June 1, 1918.

The ingredients, are:

One and one-quarter pounds of celluloid,

One gallon of acetone One gallon of unsmoked gum rubber.

The quantities referred to above will indicate the proportions which may be used to the best advantage although it will be understood that these proportions may be changed to some degree, for securing the desired results.

In preparing the compound, I proceed as follows:

The raw unsmoked gum rubber is placed in an agitator or mixer and is cut in a quantity of benzol until a very thick (paste results. The mixer or agitator shoul be kept in actuation until a paste about as thick as glucose has been formed. The unsmoked rubber gum is more desirable than the smoked rubber for the reason that it is stronger and is of a lighter color, and a coloring may thereby be added for the purpose of coloring the compound to a shade lighter than would be obtainable with the smoked rubber. It should be borne in mind, however, that the smoked rubbber may be employed if for any reason it is found dcsirable although if the compound is colored after being prepared, only the darker shades can be obtained. Tetrachlorid of carbon may be used in place of benzol if desired and it will be found that this cuts the rubber gum sufiiciently to provide the paste but it has the disadvantage of evaporating more rapidly than benzol and if the container is left open while the mixture is being made into the paste, care must be used to prevent able and while I have been using the paste becoming too thick because of the Specification of'Letters Patent. Patented Se t. 6 1921 I Application filed February 1, 1919. Serial No. 274,554.

suitable mixer or agitator whereupon the A latter is kept in operation until the mixture has the proper consistency so that the gum paste and the celluloid mixture are combined and thoroughly mixed. The celluloid I most desirable and from which the best re sults are secured is the so-called sheet celluloid such as iscommonly used by automo- 1 bile top manufacturers.-

The waste scraps of sheet celluloid are thereby rendered valuthese scraps to advantage, it should be understood that any other celluloid may be employed in making the compound so long as it is soluble in acetone and contains no mineral or oxid.

After the mixture has been thoroughly agitated it can be colored any shade desired.

' While it hase been found desirable to mix equal portions of the celluloid mixture with the rubber mixture, it should be understood that any changes in the proportion might be made if a stiff or flexible backing 1s desired when the compound is used for tabbing and bookbinding. If the proportions are i i will be found that the result; is a very flexible tabbing and of course, these proportions maybe varied so-that the desired flexibility may. be obtained. It will be found that these changes in the proportions will not in- I terfere with the dryingand lasting qualities ofthe compound. It should be also-pointed out that the celluloid ma becut-in both the acetone and the tetrach orid of carbon .by

cuttin the celluloid with one-half the quan tity o acetone and then thinning the mix ture with tetrachlorid of carbon.

Inasmuch as the compound is flexible, easilydried andmay be applied with a brush and is always used cold, it will be readily understood that it is especially adapted for tabbing and bookbinding. It needs no heatcelluloid and gum rubber in a mixture of 10 ing and will dry very quickly when applied benzol, acetone and carbon tetrachlorid.

and also possesses an attractive gloss which In testimony whereof I afiix my signature the compound described in my pending case in presence of two witnesses.

above referred to does not possess.

Having thus fully described my invention SAMUEL BRICK 'what I claim as new and desire to secure by Witnesses:

Letters Patent, is r O. H. FORREST, A composition consisting of a solution of W. B. SMITH. 

